<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="index.css" />
  <title>Light/Dark Mode</title>
</head>

<body>
  <div class="container">
    <h1>Light / Dark Mode</h1>
    <input class="container_toggle" type="checkbox" id="switch" name="mode" />
    <label for="switch">Toggle</label>
  </div>
  <script src="index.js"></script>
</body>

</html>